Carnitas Tamale Pie

Name: Carnitas Tamale Pie
Ingredients: 2 1/2 lb. boneless, skinless pork shoulder, cut into 1 pieces; 3 tsp. kosher salt; 2 scallions, sliced, plus more for serving; 4 cloves garlic, peeled; 1/4 c. fresh oregano leaves or 4 tsp. dried oregano; Juice of 1 orange; Juice of 1 lime; 1 tsp. ground cumin; 1 c. salsa verde, plus more for serving; 1 large egg; 1/2 c. chopped pickled jalapeños; 1/2 c. creamed corn; 1/2 c. sour cream, plus more for serving; 1 (8.5-oz.) box Jiffy corn muffin mix; Cooking spray; 1 c. shredded cheddar; 1/2 c. shredded pepper Jack cheese; Chopped fresh cilantro and finely chopped tomatoes, for serving